Cita APA

Nelson, G., & Winters, T. (1993). Operations in English: 55 natural and logical sequences for language acquisition. United States: Pro Lingua Associates.

Citación estilo Chicago

Nelson, Gayle, y Thomas Winters. Operations in English: 55 Natural and Logical Sequences for Language Acquisition. United States: Pro Lingua Associates, 1993.

Cita MLA

Nelson, Gayle, y Thomas Winters. Operations in English: 55 Natural and Logical Sequences for Language Acquisition. United States: Pro Lingua Associates, 1993.